Supplemental cash flow (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Supplemental operating cash flow information
Cash paid for interest	$ 87	$ 88
Income tax payments, net of (refunds)	(8)	(12)
Supplemental non-cash investing and financing activities:
Accrued capital expenditures	21	$ 13
Portion of Term Loan B accounted for as a debt modification	$ 103